I agree that at times he's underrated, but remember this: He did more ghost related business in GB2 than Peter did. While Peter was wining & dining Dana, Winston was swimming in the river of slime with Ray and Egon, playing at birthday parties, etc. Yes, he was hired help for the guys at first, but he did become part of team. He and Ray are the ones who really do the leg work while Egon experiments with stuff and Peter tags along when needed. So I understand your point, but I think you'll see that he is used and valued more than you think if you look closer, he and Ray do the most field work.